JP5024731B2 - Granulation compression molding method and compression molding apparatus - Google Patents

Description

  The present invention relates to a compression molding method and a compression molding apparatus for a granulated product. More specifically, the present invention relates to a compression molding method for producing a granulated product, so-called tablet or briquette, by compression molding a raw material, for example, a powder raw material with a pair of pressure rolls, and a compression molding apparatus applied to the compression molding method.

  Conventionally, there is a briquette machine as one of the roll compression molding machines that obtain a granulated product by compression molding a powder raw material, and the feature is that a granulated product with uniform grains can be granulated with high productivity without a binder. Yes (see, for example, Patent Document 1).

JP-A-9-192896

In the conventional briquette machine, when trying to granulate a small briquette of 0.1 to 3 mm, there is a problem that the raw material adheres to the roll pocket, making it difficult to collect the granulated product and making stable granulation impossible. When the recovered granulated product is also reduced in size, it becomes difficult to separate burrs, and the appearance of the granulated product is greatly reduced.
Then, an object of this invention is to provide the method and compression granulation apparatus which compress-granulate the small granulated material with a good external appearance.

  The compression molding method of the granulated product of the present invention is a compression molding method for obtaining a granulated product by compressing a raw material by a pair of pressure rolls rotating in a biting direction, and at least one pressure roll, A belt having a number of through holes and longer than the circumference of the roll is attached, and the belt is tightly attached to the belt by at least one tension generating roll so that the belt is in close contact with the pressure roll. By pressing into the through hole of the belt by the biting effect and rotating a pair of rolls at different peripheral speeds, the raw material that was not pushed into the hole of the belt by the shearing force is separated, and compression molding of the same shape as the through hole of the belt Granulate the product, and after the granulation, the belt is separated from the pressure roll, and the granulated product granulated in the through hole can be made by air, vibration, mechanical extrusion method, or a combination of these. Readily characterized by enabling recovery.

  According to the present invention, since the unfilled raw material is separated from the raw material filled in the through-hole of the belt by the shearing force, it is possible to produce a granulated product having a good appearance. It is particularly suitable for a granulated product having a small particle diameter of 0.1 to 3 mm.

In addition, since the belt after being filled with the material is released from the close contact with the pressure roll, it can be manufactured by air, vibration, mechanical extrusion method (for example, pin pushing action), or a combination of these. The recovery of the particles becomes easy.

  The granulated product compression molding method and compression molding apparatus of the present invention will be described below with reference to the accompanying drawings. A granulation compression molding apparatus according to an embodiment of the present invention is a belt-mediated roll compression molding machine that compresses a raw material, for example, a powdery substance into a tablet, as shown in FIG. And a pair of pressure rolls 1 and 2 that are cylindrical and face each other, and each is rotatably disposed inward as indicated by arrows R1 and R2, and between the pressure rolls 1 and 2 And a screw feeder 3 as a supply means for feeding a powdery substance between the pressure rolls 1 and 2. The screw feeder 3 includes a hopper 4 for feeding the raw material, a screw 5 for pushing the raw material into the hopper 4, and a drive motor (not shown) for driving the screw 5.

The pressure rolls 1 and 2 can be rotated by an electric motor and a speed reducer (not shown) so that the outer peripheral speeds are different. As shown in FIG. 2, belts 8 and 9 having a large number of through holes 6 and 7 are attached to the pressure rolls 1 and 2, and appropriate tension is applied by a tension generation roll 10. Prevent deflection and misalignment. In order to prevent the belt from bending and shifting more reliably, as shown in FIG. 3, the pin 11 provided at both ends of the pressure rolls 1 and 2 and the corresponding pin hole 12 provided in the belt are engaged. Also good. Further, a similar pin may be provided on the tension generating roll 10.

  In the case of the roll compression molding machine according to the present embodiment, the pressure rolls 1 and 2 have a diameter of 115 mm, the through holes 6 and 7 of the belt have a cylindrical shape with an inner diameter of 1 mm, and the thickness of the belt is 0. .15 mm. In implementation, the value is not particularly limited.

  Further, as shown in FIG. 1, the pressure roll 1 has an outer periphery that is formed at a diagonally lower position and has a cylindrical shape and is directed in the same direction as the pressure roll 1 and faster than the outer speed of the pressure roll 1. An auxiliary roll 13 that rotates in the arrow direction R3 at a speed is disposed to face the pressure roll 1. In addition, the code | symbol 14 in FIG. 1 is the scraper separately fixed with respect to the outer peripheral part of the auxiliary | assistant roll 13. As shown in FIG.

In the roll compression molding machine configured as described above, the pressure roll 1 has an outer peripheral speed of, for example, 0.018 m / sec, and the pressure roll 2 has an outer peripheral speed of 0.012 m / sec in the directions indicated by arrows R1 and R2, respectively. After rotating, the screw feeder 3 is driven, and then a powdery substance is put into the screw feeder 3 and fed between the pressure rolls 1 and 2. Then, as shown in FIG. 4 in which the granulated portion is enlarged, the powdery substance is first compression-molded into a short cylindrical shape by the through holes 6 and 7 of the belt attached to the pressure rolls 1 and 2, Due to the difference in the outer peripheral speeds (different speeds) of the pressure rolls 1 and 2, a shearing force acts on the outer tip of the compression-molded granulated product, and the through holes 7 of the belt attached to the pressure roll 2 The burrs 15 of the granulated material inside are removed.

Along with this, the granulated material W in the molding hole 7 in the pressure roll 2 is moved to the collecting means 16 with the burrs removed, and as shown in FIG. The granulated product W is separated and collected.

  On the other hand, the granulated material in the molding hole 6 in the pressure roll 1 is moved to the auxiliary roll 13 with the burr 15 attached, and then rotated in the arrow direction R3 at an outer peripheral speed faster than the outer peripheral speed of the pressure roll 1. The burr 15 is removed by the auxiliary roll 13, and then the granulated product W can be obtained in the same manner as the pressure roll 2.

  The material of the belts 8 and 9 can be appropriately selected according to the target raw material, such as metal, resin, rubber, and cloth.

  The collection means 16 is not limited to air, and may be, for example, pulse air, mechanical vibration, ultrasonic waves, mechanical extrusion means (pins), or a combination thereof.

The shape of the through-holes 6 and 7 is not limited to a cylindrical shape, but is a polygon such as a triangle, a quadrangle, or a pentagon, an indefinite shape such as a star shape, a flower shape, or an animal shape, a tapered shape, a stepped shape, or the like. Any through hole can be provided.

It is a principal part longitudinal cross-sectional view of the granulation compression molding apparatus concerning one embodiment of this invention. It is AA or BB arrow view of the roll in FIG. FIG. 2 is an assembled state diagram of a tension generating roll when a belt driving pin is provided on the pressure roll in FIG. 1. It is an enlarged view of the granulation part in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Pressure roll 3 Screw feeder 4 Hopper 5 Screw 6, 7 Belt through hole 8, 9 Belt 10 Tension generating roll 11 Belt drive pin 12 Belt drive pin hole 13 Auxiliary roll 14 Scraper 15 Burr 16 Granulated material Collection means

Claims (5)

In a compression molding method of obtaining a granulated product by compressing raw materials with a pair of pressure rolls rotating in the direction of biting into each other,
Attaching a belt having a plurality of through holes in at least one of the pair of pressure rolls and longer than the circumference of the pressure roll;
A pair of pressure rolls are rotated at different peripheral speeds in a state in which the belt is tensioned by at least one tension generation roll and the belt is in close contact with the pressure roll. The method includes a step of compressing and filling a through hole and granulating a compression molded product having the same shape as the through hole, and a step of separating unfilled raw material from the belt by a shearing force generated by a difference in peripheral speed. Compression molding method for granulated products.   The belt in which the raw material is pushed into the through-hole is formed from the through-hole of the belt by a process of releasing the contact of the pressure roll by rotating the roll and air, vibration, mechanical extrusion, or a combination thereof. 2. The granulated product compression molding method according to claim 1, further comprising a step of recovering the granules. A pair of pressure rolls rotating in the direction of biting with each other;
A belt that is attached to at least one of the pair of pressure rolls, has a number of through holes, and is longer than the circumference of the pressure roll;
At least one tension generating roll for applying tension to the belt;
A compression molding apparatus comprising:
By rotating the pair of pressure rolls in a direction in which they are engaged with each other, the raw material is pressed between the pair of pressure rolls and compressed into a through hole of a belt attached to at least one of the pressure rolls. A compression molding apparatus characterized by obtaining a granulated product. 4. The compression molding apparatus according to claim 3, further comprising means for recovering the granulated product that has been granulated by being pushed into the through hole of the belt from the through hole. The compression molding apparatus according to claim 4, wherein the collection unit collects the granulated material from the through hole of the belt by air, vibration, mechanical extrusion, or a combination thereof.